/*
Functions?and?structures?for?dealing?with?image?features

Copyright?（C）?2006-2010??Rob?Hess?

@version?1.1.2-20100521
*/

#include?“utils.h“
#include?“imgfeatures.h“

#include?

#include?

static?int?import_oxfd_features（?char*?struct?feature**?）;
static?int?export_oxfd_features（?char*?struct?feature*?int?）;
static?void?draw_oxfd_features（?IplImage*?struct?feature*?int?）;
static?void?draw_oxfd_feature（?IplImage*?struct?feature*?CvScalar?）;

static?int?import_lowe_features（?char*?struct?feature**?）;
static?int?export_lowe_features（?char*?struct?feature*?int?）;
static?void?draw_lowe_features（?IplImage*?struct?feature*?int?）;
static?void?draw_lowe_feature（?IplImage*?struct?feature*?CvScalar?）;


/*
Reads?image?features?from?file.??The?file?should?be?formatted?as?from
the?code?provided?by?the?Visual?Geometry?Group?at?Oxford:


@param?filename?location?of?a?file?containing?image?features
@param?type?determines?how?features?are?input.??If?\a?type?is?FEATURE_OXFD
	the?input?file?is?treated?as?if?it?is?from?the?code?provided?by?the?VGG
	at?Oxford:

	http://www.robots.ox.ac.uk:5000/~vgg/research/affine/index.html

	If?\a?type?is?FEATURE_LOWE?the?input?file?is?treated?as?if?it?is?from
	David?Lowe‘s?SIFT?code:

	http://www.cs.ubc.ca/~lowe/keypoints??
@param?features?pointer?to?an?array?in?which?to?store?features

@return?Returns?the?number?of?features?imported?from?filename?or?-1?on?error
*/
int?import_features（?char*?filename?int?type?struct?feature**?feat?）
{
	int?n;

	switch（?type?）
	{
	case?FEATURE_OXFD:
		n?=?import_oxfd_features（?filename?feat?）;
		break;
	case?FEATURE_LOWE:
		n?=?import_lowe_features（?filename?feat?）;
		break;
	default:
		fprintf（?stderr?“Warning:?import_features（）:?unrecognized?feature“?\
				“type?%s?line?%d\n“?__FILE__?__LINE__?）;
		return?-1;
	}

	if（?n?==?-1?）
		fprintf（?stderr?“Warning:?unable?to?import?features?from?%s“	\
			“?%s?line?%d\n“?filename?__FILE__?__LINE__?）;
	return?n;
}



/*
Exports?a?feature?set?to?a?file?formatted?depending?on?the?type?of
features?as?specified?in?the?feature?struct‘s?type?field.

@param?filename?name?of?file?to?which?to?export?features
@param?feat?feature?array
@param?n?number?of?features?

@return?Returns?0?on?success?or?1?on?error
*/
int?export_features（?char*?filename?struct?feature*?feat?int?n?）
{
	int?r?type;

	if（?n?<=?0??||??!?feat?）
	{
		fprintf（?stderr?“Warning:?no?features?to?export?%s?line?%d\n“
				__FILE__?__LINE__?）;
		return?1;
	}
	type?=?feat[0].type;
	switch（?type?）
	{
	case?FEATURE_OXFD:
		r?=?export_oxfd_features（?filename?feat?n?）;
		break;
	case?FEATURE_LOWE:
		r?=?export_lowe_features（?filename?feat?n?）;
		break;
	default:
		fprintf（?stderr?“Warning:?export_features（）:?unrecognized?feature“?\
				“type?%s?line?%d\n“?__FILE__?__LINE__?）;
		return?-1;
	}

	if（?r?）
		fprintf（

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-12-18?14:52??sift_match\
?????目錄???????????0??2018-12-13?20:09??sift_match\.vs\
?????目錄???????????0??2018-12-13?20:09??sift_match\.vs\sift_process\
?????目錄???????????0??2018-12-13?20:09??sift_match\.vs\sift_process\v14\
?????文件???????49664??2018-12-18?14:52??sift_match\.vs\sift_process\v14\.suo
?????目錄???????????0??2018-12-13?20:11??sift_match\sift_process\
?????目錄???????????0??2018-12-18?14:52??sift_match\sift_process\match\
?????文件???????48824??2010-05-21?12:48??sift_match\sift_process\match\beaver.png
?????文件???????39513??2010-05-21?12:48??sift_match\sift_process\match\beaver_xform.png
?????文件???????14956??2010-05-21?14:50??sift_match\sift_process\match\imgfeatures.c
?????文件????????3861??2010-05-21?14:50??sift_match\sift_process\match\imgfeatures.h
?????文件???????15666??2010-05-21?14:50??sift_match\sift_process\match\kdtree.c
?????文件????????3681??2010-05-21?14:50??sift_match\sift_process\match\kdtree.h
?????文件????????3154??2018-12-13?19:33??sift_match\sift_process\match\match.c
?????文件????????5098??2010-05-21?14:50??sift_match\sift_process\match\minpq.c
?????文件????????2096??2010-05-21?14:50??sift_match\sift_process\match\minpq.h
?????文件???????36594??2010-05-21?14:50??sift_match\sift_process\match\sift.c
?????文件????????5093??2018-12-13?17:05??sift_match\sift_process\match\sift.h
?????文件????????7553??2018-12-13?19:30??sift_match\sift_process\match\utils.c
?????文件????????5802??2018-12-13?17:03??sift_match\sift_process\match\utils.h
?????文件???????18260??2010-05-21?14:50??sift_match\sift_process\match\xform.c
?????文件????????6596??2010-05-21?14:50??sift_match\sift_process\match\xform.h
?????目錄???????????0??2018-12-13?20:12??sift_match\sift_process\Release\
?????文件??????137114??2018-12-13?20:27??sift_match\sift_process\Release\imgfeatures.obj
?????文件??????132122??2018-12-13?20:27??sift_match\sift_process\Release\kdtree.obj
?????文件??????122830??2018-12-13?20:27??sift_match\sift_process\Release\match.obj
?????文件??????120300??2018-12-13?20:27??sift_match\sift_process\Release\minpq.obj
?????文件??????160458??2018-12-13?20:27??sift_match\sift_process\Release\sift.obj
?????文件????????2109??2018-12-13?20:27??sift_match\sift_process\Release\sift_process.log
?????目錄???????????0??2018-12-13?20:27??sift_match\sift_process\Release\sift_process.tlog\
?????文件???????11278??2018-12-13?20:27??sift_match\sift_process\Release\sift_process.tlog\CL.command.1.tlog
............此處省略15個文件信息